Abstract
The 10-mm nylon Dorr-Oliver cyclone is assumed to perform according to the Los Alamos respirable mass sampling criteria used in the ACGIH TLV for quartz at some flow rate. The present study determines the validity of this assumption and the flow rate at which the cyclone best approximates the Los Alamos criteria. Monodis-perse particles generated by a spinning disk are tagged with 113In to permit short sampling periods at low particle concentrations. To avoid uncertainties connected with aerodynamic size measurements based on diameters taken from electron micrographs and particle density assumptions, a photographic adaptation of the Millikan apparatus is used to measure falling speed directly. The relationships of present results to previous work are discussed.
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